| Various North American Indian tribes used pictographs both as ideograms and as memory aids. |
| Later to create more words, symbols were added to pictographs to form ideographs. |
| Some pictographs were used as ideographs because they have different semantic meanings. |
| The warning pictographs are always used together with the operational safety symbols. |
| Native guides lead you on walks to ancient pictographs, swimming holes, and waterfalls. |
| There are hundreds of illustrations of the river, its people and pictographs including numerous maps and diagrams of rapids. |
