I was wondering whether there was a standard UI term for numeric textboxes with arrows that allow you to change the numeric value up or down, provided by some UI toolkits like Winforms. Here's an example of some of them:

I was wondering whether there was a standard UI term for numeric textboxes with arrows that allow you to change the numeric value up or down, provided by some UI toolkits like Winforms. Here's an example of some of them:

These are usually referred to as Spin Boxes or Spinners.
Balsamiq mockups call it a "Stepper". I have also heard spinner but that reminds me of the spinning thing when a video is loading.
That is known as a NumericUpDown Control
The NumericUpDown control looks like a combination of a text box and a pair of arrows that the user can click to adjust a value. The control displays and sets a single numeric value from a list of fixed numeric-value choices. The user can increase and decrease the number by clicking the up and down arrows, by pressing the UP and DOWN ARROW keys, or by typing a number in the text box part of the control. Clicking the UP ARROW key moves the number toward the maximum; clicking the DOWN ARROW key moves the number toward the minimum.
ctrl+left click & drag left/right. – kontur Jan 30 '13 at 13:45