How to pronounce ZeRO

ZeRO is most commonly pronounced "zeer oh" (/ˈzɪroʊ/). This is the widely-used reading among engineers, though edge cases exist.

DeepSpeed's ZeRO = "ZEro Redundancy Optimizer" (Microsoft, arXiv:1910.02054). Stylized capitalization (capital Z and O) signals it reads as the English word "zero" — identical to the number, NOT spelled out Z-E-R-O. STRESS: ZEER-oh. Stages are ZeRO-1/2/3 ("zero one/two/three"). Distinct from existing "zero-shot".

Alternate readings you might hear:

• "zee roh" /ˈziːroʊ/

Source: DeepSpeed — Zero Redundancy Optimizer (ZeRO) tutorial

Pronouncing project and product names correctly avoids the small but persistent friction of being gently corrected during standups, conference Q&As, and team calls. Hearing the word a few times locks in the right reading better than reading IPA ever will. Pronounce is a community-maintained dictionary — every entry tagged with a confidence level and (where possible) a citable source.