tia số

== Vietnamese == === Etymology === tia (“ray”) +‎ số (“number”) === Pronunciation === (Hà Nội) IPA(key): [tiə˧˧ so˧˦] (Huế) IPA(key): [tiə˧˧ ʂow˨˩˦] ~ [tiə˧˧ sow˨˩˦] (Saigon) IPA(key): [tiə˧˧ ʂow˦˥] ~ [tiə˧˧ sow˦˥] === Noun === tia số (mathematics) a "number ray", "half" of a number line that only displays natural numbers === See also === trục số