The 12961 is a Philips part number rather than an ANSI standard designation. It refers to a miniature wedge bulb in the T10 form factor with a W2.1x9.5d base, rated at 12V and 5W.
The 194 is an ANSI standard designation covering the US and Canadian markets. It is also a T10 miniature wedge bulb running at 12V, though its wattage of 3.78W is lower than the 12961.
Despite both the 12961 and the 194 sharing the T10 form factor, they carry different wattage ratings. The specifications list them for different model years of the Jeep Compass front side marker, so they are not treated as interchangeable within this application.
The front side marker of the Jeep Compass (2021) and the 2011-2013 models all use the 12961 bulb without any conditional trim notation, while the 2018-2020 models specify the 12961 only for vehicles equipped with Halogen Capsule Headlamps.
The 2017 Jeep Compass front side marker uses the 194 bulb, which stands apart from every other listed model year in this position, all of which use either the 12961 or the 3757NA.
The 3757NA is an ANSI standard dual-filament wedge bulb in the T25 form factor rated at 12V. The "NA" suffix denotes natural amber glass, which produces an amber color output without requiring an amber-tinted housing or lens.
The front side marker for the 2007-2010 Jeep Compass uses the 3757NA, making it the only position in these specifications where a natural amber dual-filament bulb is applied to a front marker function.
The rear side marker for the 2007-2010 Jeep Compass uses the 3157, a T25 dual-filament wedge bulb rated at 12V with a 27W high filament and a 7W low filament. The 3157 and 3757NA share the same T25 form factor but differ in that the 3757NA has amber glass while the 3157 does not.
The 7443 is a T20 dual-filament wedge bulb rated at 12V with filaments at 21W and 5W. The specifications apply it to the rear side marker of the 2018-2019 Jeep Compass, but only on vehicles fitted with incandescent taillamps, indicating that other taillamp configurations on those model years do not use this bulb in that position.
The dual-filament construction of the 7443 and 3157 means each bulb contains two separate filaments operating at different wattages, a design typically associated with combined stop and tail or marker and turn functions within a single housing.