The idea of this page was to bring together a collection of characters that have special skills that help the team out in a battle (missing raise attack). For example, characters' skills would have only appeared here if they raise the entire team's stats and not just their own. Or, if they lower the opponents' attack or defense (benefitting the whole team). Or, any helpful skills that help out on a large scale. Currently in Global, we have all the skills and special abilities like attack all and counter attack.
The Special Technique icons are in-game and appear in a battle next to the character when they are in effect. They signify a positive or negative status affect, like if they are stunned or if they have received an ATK boost.
The Special Skills icons do not appear in-game but signify a skill that helps you, the player, stategise with Team building and winning.
Some Special Technique symbols have been replaced in the game, possibly to make it easier for the Dokkan Battle's Game Developers. Some are replaced and others have been completely removed. Some are only used for very specific Boss battles ( long and forgotten ). I hope we see the return and increased use of some of these rare techniques.