TJ

Tj is a two-character combination that appears in various specialized domains, and it does not refer to a single, universal concept. In digital typography and document workflows, Tj is the text-showing operator in PostScript and PDF content streams. The operator Tj takes a string and renders it at the current text position; a related operator, TJ, allows an array of strings and numeric adjustments to control kerning and spacing between glyphs.

In electronics and semiconductor engineering, Tj is widely used to denote junction temperature, the temperature at the device's die. Designers track Tj to ensure reliability and to predict performance under thermal stress. Datasheets often specify maximum Tj (Tj,max) and thermal characteristics such as junction-to-ambient resistance.

In general notation, Tj can appear as an index variable or subscript in equations, such as T_j, representing a value associated with the index j. It is also used as initials for people (two-letter initials, such as T.J.) in written names or signatures, though this usage is informal and context-dependent.

Because of its different meanings, the interpretation of Tj depends on context, and readers should rely on surrounding material to determine which sense applies.