After trillion , the next large number in the standard short scale naming system is:

Number Sequence After Trillion

1. Thousand (10^3)
2. Million (10^6)
3. Billion (10^9)
4. Trillion (10^12)
5. Quadrillion (10^15)
6. Quintillion (10^18)
7. Sextillion (10^21)
8. Septillion (10^24)
   ... and so on.

So, the number that comes immediately after trillion is quadrillion (1,000 trillion or 10^15). If you want, I can provide more details or the full list of large number names!