Perhaps a Hockey 101 question re substitutions

Watching as many Hawks (and ND) games as I do, I remain confused how substitutions are communicated. I realize the coach sets the line combinations, but how do they signal who comes off/on when?

Replies:

Then there's the Ovetchkin rule - SixShutouts66 2019-04-02 21:38:39
- My error, meant odd man rush (not advantage) - SixShutouts66 2019-04-04 12:56:46
  - We knew what you meant. We laughed. * - Porpoiseboy 2019-04-04 14:19:49
    - But who is he talking about? * - DakotaDomer 2019-04-04 14:42:57
      - Brooks Porpik * - Porpoiseboy 2019-04-04 20:31:51
  - Assumed that * - BIGSKYND 2019-04-04 13:14:36
- Odd man situations don’t count for +/-. * - GoonSquad 2019-04-04 12:51:29
- I thought that rule was "call your coach .... - BIGSKYND 2019-04-03 08:58:18
Some substitutions besides the typical line changes are pre- - Wearendhockey 2019-04-02 17:20:19
- Might as well add ST ... - BIGSKYND 2019-04-02 18:59:03
What's said below, plus a few more - TCIrish03 2019-04-02 15:31:02
- Yeah - on the long change there are some coaches ... - BIGSKYND 2019-04-02 16:31:09
It's mostly a skill you build playing the game. - Porpoiseboy 2019-04-02 14:42:55
- Unless you're Alexi Kovalev - TCIrish03 2019-04-02 15:30:12
  - Keenan misunderstood - Kovie's idea of a "shift" ... - BIGSKYND 2019-04-02 16:26:22
    - As a Pens fan, his career is an enigma - TCIrish03 2019-04-03 15:59:55
      - No question, but "inconsistent" was his career.... - BIGSKYND 2019-04-03 16:38:51
- Yep, but try doing that when the guy behind the bench... - BIGSKYND 2019-04-02 14:51:30
  - Oh yes definitely. Especially when it counts. - Porpoiseboy 2019-04-02 14:54:18
It's a mix of things ... - BIGSKYND 2019-04-02 13:43:06