strap = strapline = tagline

就是徽标下的一个口号式的短句。

Members practising as sole practitioners or as partners or directors of firms offering surveying services are entitled to use the RICS logo and strap. (‘RICS – the mark of property professionalism worldwide’).

又：

As we begin 2006, our strap line of RICS being "the mark of property professionalism worldwide" looks like it has come true.