Little Blinker Small Light - Lost Background

my eyesight just ain't what it used to be. When you type an alphabet letter or number, there's always a little blinking line after the letter, or if you want to start a new line, you would hit the "enter" key and this little blinker moves to the beginning of the next line so you'll know where the next letter you type will be. When you hit the space bar it moves one digit to the right.

My problem is that this little blinker is so small and light, it gets lost in the background. The question is, what is the name of this little blinker and how do I make it a little bigger and darker. I found the one for the mouse cursor/pointer/i-beam but can't find the name of this other blinker.