170/92A is common on Chinese tops, dresses and jackets. It combines height, bust or chest, and body-type information.
Quick answer: 170/92A means about 170 cm height, 92 cm bust or chest and standard A body type. For women's tops, it is usually close to Chinese L / US 8.
A dress marked 170/92A is not a US large. It is closer to US 8 in the women's chart.
If your bust is exactly 92 cm, add ease for non-stretch fabric.
Chinese body-code labels are not one-to-one with Western letter sizes.
Check whether the seller's chart shows body or garment measurements.
This page answers one specific size search intent. For the best fit, start with the linked main converter and use the centimeter measurements on the Chinese chart whenever they are available.
Marketplace labels are useful shortcuts, but brand charts, garment type, fabric stretch and body measurements can change the final fit. Treat the lookup as a nearest match, not a guaranteed size.
Chinese size labels are practical lookup shortcuts, not universal brand guarantees. A CN shoe label, clothing size, bra code or Taobao chart row can vary by seller, product category, last shape, fabric stretch and whether the chart shows body measurements or garment measurements.
When possible, use the centimeter value first: foot length for shoes, bust/waist/hip for clothing, under-bust and cup difference for bras, and the specific Taobao chart row for marketplace listings. Then use the converter result as the nearest US, UK or EU match.
For the broader explanation, read Chinese clothing labels 160/84A to 175/96A. For why these pages give estimates instead of promises, read Chinese size chart to US complete guide.