est.

剑桥词典

written abbreviation for estimated
估計；估算；估價（estimated 或 estimate的縮寫）
the town of Brownford (est. population 14,000) 佈朗福德鎮（估計人口14000人）

written abbreviation for established : used with a date to show when a company or organization was begun
建立於；設立於；創立於（established的縮寫）
P. R. Jones & Co, Est. 1920 P.R.瓊斯公司，創立於1920年 返回 est.