People writing "gb" for gigabytes...
"g" is for grammes and "b" is for bits, so "gb" is gram-bits.
"G" is for giga and "B" is for bytes, so "GB" denotes gigabytes.
Also writing memory as "Gb", which is gigabits.
Nothing is measured in gigabits; data rates are often expressed in gigabits per second, "Gbps" or "Gb/s".
This is especially prevalent in the case of mobile phones, where there are both data rates (expressed in gigabits per second ("Gbps") and phone memory (expressed in gigabytes, "GB").
However, I did once have someone from a mobile supplier telling me that they were in fact the same thing.
Then we have data rates being written as "mb" or "mbps".
"m" is for milli (1/1000th).
So an "mb" is a milli-bit, which doesn't exist.
Whenever I see someone purporting to be knowledgeable about a topic writing "gb" or "mb", I inherently reject their post on the basis they don't even know their units.