Why are corners not showing up in Vim?

Question

vim

Instead of corners like here , Vim shows some bullshit:

Here is the .vimrc :

set nocompatible              " be iMproved, required
filetype off                  " required

"=====================================================
" Vundle settings
"=====================================================
" set the runtime path to include Vundle and initialize
set rtp+=~/.vim/bundle/Vundle.vim
call vundle#begin()

Plugin 'gmarik/Vundle.vim'		" let Vundle manage Vundle, required

"---------=== Code/project navigation ===-------------
Plugin 'scrooloose/nerdtree' 	    	" Project and file navigation
Plugin 'majutsushi/tagbar'          	" Class/module browser

"------------------=== Other ===----------------------
Plugin 'bling/vim-airline'   	    	" Lean & mean status/tabline for vim
Plugin 'fisadev/FixedTaskList.vim'  	" Pending tasks list
Plugin 'rosenfeld/conque-term'      	" Consoles as buffers
Plugin 'tpope/vim-surround'	   	        " Parentheses, brackets, quotes, XML tags, and more

"--------------=== Snippets support ===---------------
Plugin 'garbas/vim-snipmate'		    " Snippets manager
Plugin 'MarcWeber/vim-addon-mw-utils'	" dependencies #1
Plugin 'tomtom/tlib_vim'		        " dependencies #2
Plugin 'honza/vim-snippets'		" snippets repo

"---------------=== Languages support ===-------------
" --- Python ---
Plugin 'klen/python-mode'	            " Python mode (docs, refactor, lints, highlighting, run and ipdb and more)
Plugin 'davidhalter/jedi-vim' 		    " Jedi-vim autocomplete plugin
Plugin 'mitsuhiko/vim-jinja'		    " Jinja support for vim
Plugin 'mitsuhiko/vim-python-combined'  " Combined Python 2/3 for Vim

" --- JavaScript(ES6) ---
Plugin 'isRuslan/vim-es6'               " ES6 synthax support (requires SnipMate)

"---------------=== Color schemes ===-----------------
Plugin 'lsdr/monokai'                   " monokai
Plugin 'NLKNguyen/papercolor-theme'     " PaperColor

call vundle#end()            		    " required
filetype on
filetype plugin on
filetype plugin indent on

"=====================================================
" General settings
"=====================================================
set backspace=indent,eol,start
aunmenu Help.
aunmenu Window.
let no_buffers_menu=1
set mousemodel=popup

set ruler
set completeopt-=preview
set gcr=a:blinkon0
if has("gui_running")
  set cursorline
endif
set ttyfast

" включить подсветку кода
syntax on
if has("gui_running")
" GUI? устаналиваем тему и размер окна
  set lines=50 columns=125
  colorscheme monokai
 "раскомментируйте эти строки, если хотите, чтобы NERDTree/TagBar автоматически отображались при запуске vim
 autocmd vimenter * TagbarToggle
 autocmd vimenter * NERDTree
 autocmd vimenter * if !argc() | NERDTree | endif

" на маке vim?
if has("mac")
  set guifont=Consolas:h13
  set fuoptions=maxvert,maxhorz
else
" дефолтный GUI
  set guifont=Monospace\ 10
endif
else
" терминал?
  colorscheme myterm
endif

tab sball
set switchbuf=useopen

" отключаем пищалку и мигание
set visualbell t_vb= 
set novisualbell       

set enc=utf-8	     " utf-8 по дефолту в файлах
set ls=2             " всегда показываем статусбар
set incsearch	     " инкреминтируемый поиск
set hlsearch	     " подсветка результатов поиска
set nu	             " показывать номера строк
set scrolloff=5	     " 5 строк при скролле за раз

" отключаем бэкапы и своп-файлы
set nobackup 	     " no backup files
set nowritebackup    " only in case you don't want a backup file while editing
set noswapfile 	     " no swap files

" прячем панельки
"set guioptions-=m   " меню
set guioptions-=T    " тулбар
"set guioptions-=r   "  скроллбары

" настройка на Tab
set tabstop=4
set shiftwidth=4
set smarttab
set expandtab

"  при переходе за границу в 80 символов в Ruby/Python/js/C/C++ подсвечиваем на темном фоне текст
augroup vimrc_autocmds
    autocmd!
    autocmd FileType ruby,python,javascript,c,cpp highlight Excess ctermbg=DarkGrey guibg=Black
    autocmd FileType ruby,python,javascript,c,cpp match Excess /\%80v.*/
    autocmd FileType ruby,python,javascript,c,cpp set nowrap
augroup END

" указываем каталог с настройками SnipMate
let g:snippets_dir = "~/.vim/vim-snippets/snippets"

" настройки Vim-Airline
set laststatus=2
let g:airline_theme='badwolf'
let g:airline_powerline_fonts = 1
let g:airline#extensions#tabline#enabled = 1
let g:airline#extensions#tabline#formatter = 'unique_tail'

" TagBar настройки
map <F4> :TagbarToggle<CR>
let g:tagbar_autofocus = 0 " автофокус на Tagbar при открытии

" NerdTree настройки
" показать NERDTree на F3
map <F3> :NERDTreeToggle<CR>
"игноррируемые файлы с расширениями
let NERDTreeIgnore=['\~$', '\.pyc$', '\.pyo$', '\.class$', 'pip-log\.txt$', '\.o$']  

" TaskList настройки
map <F2> :TaskList<CR> 	   " отобразить список тасков на F2

" Работа буфферами
map <C-q> :bd<CR> 	   " CTRL+Q - закрыть текущий буффер

"=====================================================
" Python-mode settings
"=====================================================
" отключаем автокомплит по коду (у нас вместо него используется jedi-vim)
let g:pymode_rope = 0
let g:pymode_rope_completion = 0
let g:pymode_rope_complete_on_dot = 0

" документация
let g:pymode_doc = 0
let g:pymode_doc_key = 'K'
" проверка кода
let g:pymode_lint = 1
let g:pymode_lint_checker = "pyflakes,pep8"
let g:pymode_lint_ignore="E501,W601,C0110"
" провека кода после сохранения
let g:pymode_lint_write = 1

" поддержка virtualenv
let g:pymode_virtualenv = 1

" установка breakpoints
let g:pymode_breakpoint = 1
let g:pymode_breakpoint_key = '<leader>b'

" подстветка синтаксиса
let g:pymode_syntax = 1
let g:pymode_syntax_all = 1
let g:pymode_syntax_indent_errors = g:pymode_syntax_all
let g:pymode_syntax_space_errors = g:pymode_syntax_all

" отключить autofold по коду
let g:pymode_folding = 0

" возможность запускать код
let g:pymode_run = 0

" Disable choose first function/method at autocomplete
let g:jedi#popup_select_first = 0
let g:jedi#auto_initialization = 1

How to fix?
PS OS Debian Jessie with Gnome Shell

Answer 1

You need a font that supports this nonsense, these are not standard Unicode characters.
Here is a selection of fonts with these arrows added: https://github.com/powerline/fonts