Signalling refers to the act of communicating something to others. There are several synonyms that can be used instead of signalling, such as indicating, demonstrating, conveying, revealing, signifying, displaying, and manifesting. Using any of these words in place of signalling can help to add variety and nuance to your writing or speech. For example, instead of saying "He was signalling his disapproval", you could say "He was conveying his disapproval through his body language". Synonyms like these can help to add depth and interest to your writing and make it more engaging for your readers or listeners.