x_{1} is a complex number (understood as such).

Not necessarily strictly imaginary (or real, for that matter). This word relies on xo'ei to implicitly fill both sides of ka'o. See also: ka'o'ai zei namcu, noka'ono (with PA neither immediately before nor immediately after it), nozeika'o zei namcu, and ka'ozeino zei namcu.

- kanro
- x
_{1}is healthy/fit/well/in good health by standard x_{2}. - namcu
- x
_{1}(li) is a number/quantifier/digit/value/figure (noun); refers to the value and not the symbol. - zekri
- x
_{1}(event/state) is a punishable crime/[taboo/sin] to people/culture/judges/jury x_{2}.

- cmapagjvo
- x
_{1}(text) is a lujvo with meaning x_{2}and arguments x_{3}, and which is constructed from tanru/veljvo x_{4}such that each element of the veljvo is ultimately only a cmavo (including "{zei}", "{ke}"/"{ke'e}", "{bo}", etc.), gismu, or rafsi of such cmavo or gismu. - zejvo
- x
_{1}(text) is a Lojban compound predicate using the particle “zei”; with meaning x_{2}, arguments x_{3}, built from metaphor (tanru) x_{4}. - luvrzei
- x
_{1}(text) is a Lojban compound predicate using the particle “zei”; with meaning x_{2}, arguments x_{3}, built from metaphor (tanru) x_{4}. - zeiljvo
- x
_{1}(text) is a Lojban compound predicate using the particle “zei”; with meaning x_{2}, arguments x_{3}, built from metaphor (tanru) x_{4}. - zo si si zei fa'o
- x
_{1}is a nonsense zei-lujvo using parts x_{2}, silly by standard x_{3}.

- lujna'u
- x
_{1}is a complex number. - tolxarna'u
- x
_{1}is a real number. - kai'o
- quaternion i
- ka'o'ai
- imaginary i (non-comma)
- 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.
- kau'o
- generic algebra unit e
_{n} - kei'o
- quaternion j
- koi'o
- quaternion k
- ka'omcu
- x
_{1}is a complex number with real part x_{2}and imaginary part x_{3} - epsi bu
- digit/number: dual ε of dual number in linear algebra; square root of 0
- ka'ozeino zei namcu
- x
_{1}is a pure real number (such that its imaginary part is 0) understood as an example of a complex number. - nozeika'o zei namcu
- x
_{1}is a pure imaginary number (such that its real part is 0) understood as an example of a complex number.