These are the common abbreviations for battery systems. These terms are used universally and can also be found in this product catalog.
A round battery (see table) is indicated as round, and a flat battery as flat. The letter P is used for all batteries that are not round. Many chemical abbreviations can therefore include, in addition to an R, an F (flat) or a P.
B = Lithium carbon monofluoride (low drain)
BRC = Lithium manganese dioxide (high drain)
CR = Lithium manganese dioxide
ER = Lithium thionyl chloride
FR = Lithium iron disulfide
GR = Cadmium
KR = Alkaline
LR = Alkaline
MR = Mercury
PR = Zinc-air
SR = Silver oxide
An LR battery is therefore a round alkaline battery. A flat alkaline battery would therefore be designated as an LF battery, etc.