tứ

Etymology 1
.

Numeral

 * 1)  four

Usage notes

 * Like all Sino-Vietnamese numerals smaller than, the "standard" reading tứ itself is never used as a cardinal number (for counting, etc.), where native numerals are used instead; its use therefore is restricted to compounds.
 * However, the variant is used in titles (e.g.  tư) and in forming numerals bigger than 10.
 * Comparing to Chinese and other Sino-Xenic languages, there is little to no taboo regarding the number "four" in Vietnamese. In fact, tứ/ is actually one of the few Sino-Vietnamese numerals that enjoy usages outside of fixed compounds, and the one of the two Sino-Vietnamese items (along ) that had penetrated into the (lower) cardinal counting system, where it coexists with native.
 * Comparing to Chinese and other Sino-Xenic languages, there is little to no taboo regarding the number "four" in Vietnamese. In fact, tứ/ is actually one of the few Sino-Vietnamese numerals that enjoy usages outside of fixed compounds, and the one of the two Sino-Vietnamese items (along ) that had penetrated into the (lower) cardinal counting system, where it coexists with native.
 * Comparing to Chinese and other Sino-Xenic languages, there is little to no taboo regarding the number "four" in Vietnamese. In fact, tứ/ is actually one of the few Sino-Vietnamese numerals that enjoy usages outside of fixed compounds, and the one of the two Sino-Vietnamese items (along ) that had penetrated into the (lower) cardinal counting system, where it coexists with native.