Communication anti-pattern Amelia Walter-Dzikowska warns against. Example sentence from a real project: 'This doesn't look like BAU, what is the POC and ETA for the fix, find the RCA ASAP, will it be up by EOD?' (business-as-usual, person of contact, estimated time of arrival, root cause analysis, as soon as possible, end of day). Some abbreviations carry multiple meanings — POC can be proof of concept, person of color, or person of contact. Not an international-communication problem specifically; a general-communication problem. Advice: use abbreviations sparingly and only when clear to the audience.