j (EN)

letter, symbol

letter “j”

1. the lowercase form of the letter "J"
   Mellen Iech un, fir d'Iwwersetzungen vun den Beispillsätz an d'monolingual Definitioune vun all Wuert ze gesinn.

   The word "jet" starts with the letter "j".

symbol “j”

1. in mathematical notation in electronics, a symbol used to represent the square root of -1
   In electrical engineering, we use j instead of i to represent the square root of -1, so that it is not confused with current.
2. in mathematics, a symbol representing the second unit vector following "i"
   In a 3D coordinate system, the vector j points directly up along the y-axis.