Turn a link into an HTML entity with exact same functionality

I have this link:

<%= link_to "+1", video_votes_path( :video_id => video.id, :type => "up" ), :method => :post, :remote => true %>
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but I want to turn its visual appearance to this: ⇑ with the HTML entity ⇑. How can I do this while keeping the link's functionality?

<%= link_to "&uArr;".html_safe, video_votes_path( :video_id => video.id, :type => "up" ), :method => :post, :remote => true %>