est.

劍橋詞典

written abbreviation for estimated
估計(jì)；估算；估價(jià)（estimated 或 estimate的縮寫(xiě)）
the town of Brownford (est. population 14,000) 佈朗福德鎮(zhèn)（估計(jì)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(shè)立於；創(chuàng)立於（established的縮寫(xiě)）
P. R. Jones & Co, Est. 1920 P.R.瓊斯公司，創(chuàng)立於1920年 返回 est.