First, how about PISA:
Pump In Style Advanced - Medela's everyday use double electric pump. It is widely available and very popular. There are several varieties differentiated by the type of bag they come in - for example, this is the shoulder bag:
The little yellow cube in the lower right with the tubing coming out of it is the actual pump, it is built in to the bag (though removable, you wouldn't usually operate it outside of the bag).
The predecessor to the PISA was the Pump In Style (PIS) - pretty similar, but a little bulkier and heavier.
Membranes: these are the tiny white rubber circles that seem unimportant until you tear or bend one, then you realize they have a HUGE effect on the suction!
The membranes plug in to the
Valves: These are yellow hard plastic and generally come attached to connectors, so you may not even know they are removable (I had no idea)
If you have a sudden loss of suction, it's often because you've bent or torn one of these tiny membranes, or cracked the valves (or tucked your bra under the edge of the breast shield).
Breast shield: AKA funnels or cones. The PISA kit comes with 2 piece breast shields that are the funnel and the connector (and the valve & membrane are in the connector), but when you buy replacement pieces they often sell them as a single piece like this:
Breast shields come in multiple sizes. The 24mm is the most common, and the PISA kits come with that & the larger 27mm. They also make 21mm shields. For the 2 piece shields, any size will fit on the connectors, and the funnel part can actually be used as a funnel if you are filling freezer bags - remove the connector, put the spout end into the bag, and pour into the wide end.
What other pumping terms & acronyms are you running across?
All photos from Medela
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