semiatic

Tablet or all-in-one option (tablet)

Tells the machine you use combined tablets (detergent with rinse aid and salt substitute), so it adjusts the rinse and drying to get a good result without separate rinse aid.

What the manuals say to do

Switch it on only if you use all-in-one tablets, and off if you use powder, gel or plain tablets (Whirlpool). On Beko it stays on for the next wash until you switch it off, and it may change the programme time. Keep refilling salt if your water is hard: older Bosch manuals say combined products replace salt only up to 21 °dH.

What it does not mean

It does not make salt unnecessary in hard water — the older Bosch manual sets the limit at 21 °dH — and it is not a dispenser: the tablet still goes in the detergent compartment in the door.

Makes differ, check your dishwasher’s manual: the same drawing can mean different things on different brands, and only your model’s manual says exactly what a light means and which programmes an option works with.

What it looks like
A rectangular tablet with stripes or layers, sometimes with 3in1 or Tab next to it.
Names makers use
Tablet / Tab (Whirlpool); Combi Tablet (older Beko); Tablet detergent function (Beko); auto 3in1 (older Bosch, automatic)

Where makers differ

A button on Whirlpool and Beko; a setting in the menu on newer Beko models; automatic on older Bosch machines (auto 3in1), which note the rinse programme runs correctly even if the salt or rinse aid light is on while 3in1 products are used.

Other symbols with the same shapes

Sources

No single published standard defines dishwasher panel icons, so this meaning is taken from the manuals of 3 different maker groups (Whirlpool, Beko, Bosch), each fetched and read on the date shown:

Written in our own words; quotations are the makers’ wording.