The sign is formed by a line across the right foot of the letter "R."

VOA: special.2009.03.22

Gestapo agents intercepted him and demanded he sign a letter saying that at no point had he been threatened or harassed by the Gestapo.

盖世太保们拦住了他,要求他签署一份文件，上面写着,他绝没有受到盖世太保的威胁或骚扰。

耶鲁公开课 - 心理学导论课程节选

My favorite Freud story was as he was leaving Europe during the rise of the Nazis, as he was ready to go to England from, I think, either Germany or Austria, he had to sign a letter from the Gestapo.

我最喜欢的关于弗洛伊德的故事是这样的,他在纳粹兴起之际逃离欧洲，他正准备逃到英格兰去,我想应该是从德国或者是奥地利出发，盖世太保逼迫他签署了一份文件。

耶鲁公开课 - 心理学导论课程节选