- tau'u in sense "2 pi"
- digit/number: tau (approximately 6.2831...). The constant defined by the ratio of the circumference to the radius of all circles.

- tanru
- x
_{1}is a binary metaphor formed with x_{2}modifying x_{3}, giving meaning x_{4}in usage/instance x_{5}.

- tcekitaujau
- x
_{1}is the "ce ki tau jau" dialect of Lojban, used by x_{2}to communicate x_{3}(si'o/du'u) - tcekitaujei
- x
_{1}is the 'ce ki tau jei' dialect of Lojban, used by x_{2}to communicate x_{3}(si'o/du'u)

- ka'o'ei
- imaginary i, comma - spherical coordinates: first coordinate gives magnitude (complex modulus/radius) of the number, the second number gives the angle from the positive real axis measured counterclockwise toward the 'positive' imaginary axis (default: in the primary branch/Arg) as measured in some units (which that number should contain; the contextless default will suppose radians); the angle is not normalized.
- kei'au
- mekso operator: finite result set derived from/on set A with/due to operator/function B under ordering of application C