The rebus had never an heraldic status, and it had seldom more than a temporary existence. A fanciful device adopted (we hear of many such instances) for the temporary purpose of a tournament could be so classed, but the rebus proper has some device, usually a pictorial rendering of the name of the person for whom it stood.

A Complete Guide to Heraldry by A. C. Fox-Davies, p. 455

In later Plantagenet days, badges were of considerable importance, and certain characteristics are plainly marked. They were never worn by the owner- in the sense in which he carried his shield or bore his crest; they were his sign-mark indicative of ownership; they were stamped upon his belongings in the same way in which Government property is marked with the broad arrow, and they were worn by his servants.

A Complete Guide to Heraldry by A. C. Fox-Davies, p. 454

The Heraldic Badge, as we know it, came into general use about the reign of Edward III., that is, the heraldic badge as a separate matter having a distinct existence in addition to concurrent arms, and having at the same time a distinctly heraldic character. But long before that date, badges are found with an allied reference to a particular person, which very possibly are rightly included in any enumeration of badges.

A Complete Guide to Heraldry by A. C. Fox-Davies, p. 453

Badges do not formerly appear to have ever been made the subjects of grants, and the instances which can be referred to showing their control, or attempted control, by the Crown in past times are very rare indeed. As a matter of fact, the Crown seems to have purposely ignored them.

A Complete Guide to Heraldry by A. C. Fox-Davies, p. 453

The cri-de-guerre, both as a heraldic fact and as an armorial term, is peculiar, and exclusively so, to British and French heraldry. The national cri-de-guerre of France, “Montjoye Saint Denis,” appeared above the pavilion in the old Royal Arms of France, and probably the English Royal motto, “Dieu et mon Droit,” is correctly traced to a similar origin. A distinction is still made in modern heraldry between the cri-de-guerre and the motto, inasmuch as it is considered that the former should always of necessity surmount the crest.

A Complete Guide to Heraldry by A. C. Fox-Davies, p. 452

In Germany, a distinction appears to be drawn between their “Wahlspruche” (i.e. those which are merely dictated by personal choice) and the “armorial mottoes” which remained constantly and heritably attached to the armorial bearings such as the “Gott mit uns” (“God with us”) of Prussia and the “Nihil sine Deus” of Hohenzollern.

A Complete Guide to Heraldry by A. C. Fox-Davies, p. 451