In rhetoric a parenthesis or parenthetical clause is an explanatory phrase or just one word inserted into the sentence. Such phrase may be omitted without loosing a sense of passage, however parentheses may better describe it or express attitude of the speaker or writer to events or person. Parenthesis often treated as modifier phrases but often do not carry any syntactical role at all. They are often expressed by adverbials, conjunctions and impersonal clauses.

Typical applications of parenthesis include:

• Modal meaning with words like “probably”, “certainly”, “for sure”, “must be”;
• To express ordinary behavior with phrases like “as usual”, “sometimes”;
• Source of information expressed with phrases like “it's said”, “some say”, “do you think”, etc.;
• The way of expressing thoughts and attitude to it: “let's be honest”, “in other words”, “in sum”, “in a nutshell”, “between you and me”, “joking apart”, “speaking aside”, “if you don't mind”;
• Calling a name or moniker (vocative), usually with imperatives (includes curses). For example: “Uglûk, come closer!”, “Come faster, you maggots, we must hurry before sun rises!”
• The call to another person in conversation to draw attention without naming it: “do you understand (that)…”, “get this”, “believe it or not”, “picture that”, “you see”, etc.;
• Function similar to conjunctions, to express cause and/or (con)sequence of actions: “by the way”, “for example”, “it means”, “beside this”;
• To show speaker's feeling to events: “luckily”, “fortunately”, “thank god”, “sad to say”, “I fear”, etc.;
• Express strong feeling, including interjections: “for fuck's sake!”, “damn you!”;
• Introductory phrase: “Once upon time…”, “Long time ago…”;

Any longer dependent clause describing the person or action of main sentence may be used similarly as parenthesis. Many modifier and adverbial dependent clauses inserted in the middle of the sentence belong to this category. For example:

• “Uglûk, a big and strong orc, was sitting in the corner” = “Uglûk ash dau agh pol uruk duzuzâ bonzumor” (modifier);
• “He cut his head, steady and swift strike it was, with his axe” = “Tagrishuz kaztab za fulk kuz stalgarz agh hîsarz pulktabirzi” (adverbial);
• “Uglûk sitting in the corner – he was usually silent in public places – suddenly, started his long and loudly speech.” = “Uglûk duzug bonzumor – takuzok ghil sazgor haitûrz – trosharz îsuzâ gashnumtab rodh agh rûrz”;
• “I was trying to hold on the rock with my frozen hands – I already knew that they started to rot of cold burn – in a desperate struggle to survive” = “Datugluz mankut fipir nalgdabirzi goghaga – da îstuzdok zamash tak nirgûtîs ghâshgrazumob – ash tadurmor hîrd kirbat”;

Of course, such long sentences as the last two belong to fiction literature and do not occur in normal conversation, being not very suitable for Orcs' speech.

Such phrases should be separated by punctuation marks in written speech. But Tengwar and Cirth are limited with them. It's suggested to use “two vertical dots” (means comma but look like colon) in Cirth.