1. Abbreviation for one million, the number 1,000,000
The company aims to reach 1M users by next year.
A empresa pretende atingir 1 milhão de usuários no próximo ano.
2. In social media context, refers to one million followers or views
She just hit 1M followers on Instagram.
Ela acabou de atingir 1 milhão de seguidores no Instagram.
3. In financial/business contexts, represents one million units of currency
The deal is worth 1M dollars.
O negócio vale 1 milhão de dólares.