clenched fist sign

[klĕncht]
n.
  1. An indication of the pain of angina pectoris in which an individual presses a clenched fist against the chest as a means of showing its constricting, pressing quality.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.