What does 1e-5f mean?

Is it just eulers number minus 5?

Here is the tutorial I am following:

Code (CSharp):

1.  // Update velocity if time advances
2.         if (Time.deltaTime > 1e-5f)
3.             velocity = smoothDeltaPosition / Time.deltaTime;
4.  
5.         bool shouldMove = velocity.magnitude > 0.5f && agent.remainingDistance > agent.radius;
6.  

Full tutorial here

 

1 to the power -5 = 0.00001

https://duckduckgo.com/?q=1e-5&t=ffsb&ia=calculator