Headwall

A steep to vertical cliff found at the end of a valley; often the uppermost part of a Cirque.
Found on http://www.skis.com/Glossary-of-Ski-Terms/article-12-18-2012,default,pg.htm

Headwall

The upper section of a mountain where the terrain is set off from that below by being more steep.
Found on http://santiamalpineclub.org/mountain/climbing/terms/
No exact match found