About a shell syntax

parag <[email protected]>
Newsgroups gmane.comp.gnu.utils
Organization http://groups.google.com
Message-ID <911a0721-0ee2-4568-ad58-35828acc3dd1@i36g2000prf.googlegroups.com> 
hi All,
 I tried searching for the below mentioned variable

${DASHE:-0}

What does it do?
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