Kays 208:17 :ܛܪܝܓܘܢܐ ܕܐܝ݂ܬܝܗ݀ ܬܠܝ݂ܬܝܘ݂ܬ ܓܘܢ̈ܘܬܐ‏ : triangle, which is a threesome of corners
See the entire entry for ṭrīgōn, ṭrīgōnā n.m. triangle; region