Hand signals only: How Thais are marshalling mass protests

Pro-democracy protesters attend an anti-government demonstration, in Bangkok, Thailand October 18, 2020. REUTERS/Soe Zeya Tun

BANGKOK (Reuters) - Hands point above head = need umbrella; Hands held over head = need helmet; Hands crossed over chest = enough supplies here.

Thai protesters are learning a whole new language, developed within days to coordinate among crowds of thousands of people at demonstrations that have swollen in defiance of a government ban and despite the arrest of many protest leaders.