Cov Hnub Ci Sib Txawv Sib Txawv sib txawv tau txiav txim siab nrog cov ntxaiv hlau sib txawv, feem ntau hauv cov duab plaub, ncig, daim ntawv octagonal. Raws li ib feem tseem ceeb ntawm cov neeg taug qab, lub xwmfab, ncig, lub kaum sab xis ntxaiv raj xav tau qhov ncaj ncaj thiab qhov txawv. Peb nruj tswj hwm qhov ntsuas qhov tseeb thiab ntom ntom ntom ntom ntom ntom ntawm cov khoom sib txuas, thiab tom qab ntawd txiav thiab ntswj cov kauj ob zaug tom qab tsim cov raj hlau tiav. Ncaj kom ntseeg tau tias peb cov khoom ua tau raws li qhov xav tau ntawm cov duab kos.

Cov khoom siv yeeb nkab feem ntau yog Q355 lossis 355. Raws li cov neeg siv khoom