What does the star mean in a schematic

[HappyBanana]

Hello,
excuse me if this is a stupid question, but google isn't turning up any helpful results. What does a * mean in a pin number on a schematic? I am looking over a ATSAMD21 board from adafruit (https://cdn-learn.adafruit.com/assets/assets/000/028/801/original/adafruit_products_M0SCHEM.png?1448656357) and both pins 18 and 17 have a star next to them and another number. What is the meaning of this?
Thanks,
Tyler

[Monkeh]

This is specific to Eagle. It indicates multiple physical pins or pads are assigned to that pin on the schematic. Most tools won't do this (which is depressing when you have six or more pairs of power and ground pins).

[HappyBanana]

Must you connect all the pins then? For example pin 18, 35, and 42 are all ground pins. Would I be fine if I only connected pin 35 to GND? I would think they would be connected internally.

[Kilrah]

They may or may not, the chip's datasheet would tell you about that. If in doubt better to connect them all.

[Signal32]

It indicates multiple physical pins or pads are assigned to that pin on the schematic.

What does this mean exactly?
On the schematic you can see 17*2 goes to 3V3. Then on the right 2 goes to the XTAL.

[Monkeh]

Must you connect all the pins then? For example pin 18, 35, and 42 are all ground pins. Would I be fine if I only connected pin 35 to GND? I would think they would be connected internally.

Yes, you must connect them all.

It indicates multiple physical pins or pads are assigned to that pin on the schematic.

What does this mean exactly?
On the schematic you can see 17*2 goes to 3V3. Then on the right 2 goes to the XTAL.

Not pin 2, 2 pins.

[Mechatrommer]

It indicates multiple physical pins or pads are assigned to that pin on the schematic.

What does this mean exactly?
On the schematic you can see 17*2 goes to 3V3. Then on the right 2 goes to the XTAL.

thats what it means... some chips have 4 pins or more for GND on all of its edges....

[bitwelder]

Here is the datasheet for SAM D 21, and at paragraph 5.2.1 (page 26) there is the pinout for the SAM D21 G in QFN (as used by Adafruit): http://www.atmel.com/Images/Atmel-42181-SAM-D21_Datasheet.pdf
There are indeed 2 pins on VDDIO (17 and 36), but only 3 are designated as GND (18, 35, 42). Where's the supposed fourth one? (GNDANA at pin 5 is reported separately in the schematic)

[Monkeh]

Here is the datasheet for SAM D 21, and at paragraph 5.2.1 (page 26) there is the pinout for the SAM D21 G in QFN (as used by Adafruit): http://www.atmel.com/Images/Atmel-42181-SAM-D21_Datasheet.pdf
There are indeed 2 pins on VDDIO (17 and 36), but only 3 are designated as GND (18, 35, 42). Where's the supposed fourth one? (GNDANA at pin 5 is reported separately in the schematic)

It's a QFN. There's a massive pad on the bottom.