Canon EOS Rebel T1i Instruction Manual page 110

A Setting Shooting FunctionsN
About the Information Display
Each time you press the <B> button, the information display will
change.
AF mode
·d : Live mode
·c : Face detection Live mode
·f: Quick mode
Picture Style
White balance
Drive mode
Image-recording quality
AE lock
Shutter speed
Flash-ready
Exposure level indicator/
Flash exposure compensation
When <g> is displayed in white, it indicates that the Live View image
brightness is close to what the captured image will look like.
If <g> is blinking, it indicates that the Live View image is not being
displayed at the suitable brightness due to low or bright light conditions.
However, the captured image will reflect the exposure setting.
If flash is used or bulb is set, the <g> icon and histogram will be
grayed out (for your reference). The histogram might not be properly
displayed in low or bright light conditions.
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Aperture
AEB range
AF point (Quick mode)
Magnifying frame
Histogram
AEB
FEB
Exposure
simulation
Battery check
Highlight tone priority
ISO speed
Shots remaining