Hluav taws xob cov thawv yog cov khoom tseem ceeb hauv koj lub tsev hluav taws xob.
Muaj cov thawv yas thiab hlau; "ua haujlwm tshiab" thiab "cov laus ua haujlwm" thawv; puag ncig, square, thiab octagonal thawv; thiab cov thawv nrog kev ntsaws cov kev txhawb zog rau cov cua hauv qab nthab thiab lub teeb pom kev kub hnyav. Tag nrho cov thawv uas siv thev naus laus zis rau cov kev pab cuam hauv tsev yog muaj nyob hauv cov chaw hauv tsev thiab khw muag khoom loj.
Rau ntau yam khoom siv hluav taws xob, peb feem ntau muaj ntau lub thawv hauv yas thiab hlau siv los tiv thaiv cov khoom nyob rau sab. 
