Tapered pin used to secure shift lever (counterweight) to shifter shaft on top of transmission. These often get rusted in place or damaged during removal.
2005-12 Elise/Exige/2-eleven 2ZZ and 1ZZ All
2000-05 Celica MT
2000-05 MR2-S MT
E153 Transmissions from MR2 Turbo
Labeled 33281F in diagram (MR2 Spyder application shown, Lotus/Celica is similar)