And, as the Nothing Phone (2) carried the model number A065 and the Nothing Phone (2a) is A142, the lack of sequential numbering perhaps shouldn't come as a surprise. However, the Nothing Phone (1 ...

because of the close model number style to the Nothing Phone (2), which is A065. The Nothing Phone 2a model number is A142, while the Phone (2a) Plus is A142P, so we know what the P means.