1. Property is any object which a person may own or possess. Personal property is any property other than land, except that for purposes of descent leaseholds are treated as personal property.
Personal property may be actually and technically owned (in fact as well as in theory); for it has never been subject to the feudal doctrine of 'tenure'.
Leaseholds (technically classified as 'chattels real'), strictly speaking, form an anomalous species of personal property.

2. Categories
a) Choses in possession
Those are the familiar tangible movables (books, cars, furniture) of everyday life. They can actually be possessed and be transferrred by physical delivery. They may be subject to a contract or a gift. The owner's and possessor's rights are protected against all and sundry by the law of torts and the criminal law.
b) Choses in action
They are not tangible, physical objects (debts, shares in a company); but property they are nevertheless. The owner's right to them can only be asserted by meany of an action.
More examples: negotiable instruments, patents and designs, copyright and trade names.

3. Especially: Negotiable instruments
a) They include: Bills of exchange, cheques, and promissory notes.
b) The following requirements must be satisfied in order that the court recognize an instrument as negotiable:
aa) It must be freely transferable, like cash, by delivery, in such a way as to entitle the holder of it to enforce the original promise.
bb) It must have been made negotiable by statute, or it must be a document which is treated as negotiable by statute, or it must be a document which is treated as negotiable by commercial custom.
c) Effects: Any person may sue upon them even if he has not himself given consideration or is not privy to the contract.
Like money, they may be negotiated, i.e. pass from hand to hand. If they are stolen, any person who acquires a negotiable instrument in good faith and for value will obtain good title to it, even though he acquires it directly from the thief.

4. Especially: Bills of exchange: they are unconditional orders in writing, addressed by one person to another, signed by person giving it, requiring the person to whom it is addressed to pay on demend, or at a fixed or determinable future time, a sum certain in money to, or to the order of, a specified person, or to bearer.

5. Especially: Cheques: they are bills of exchange drawn on a banker payable on demand.
If a cheque is marked 'not negotiable' it still can be transferred by the payee, but it cannot be acquired from a person who has stolen the cheque.

6. Especially: Promissory notes: They are unconditional promises in writing made by one person to another signed by the maker, engaging to pay, on demand or at a fixed or determinable future time, a sum certain in money to, or to order of, a specified person or to bearere. An IOU is not a promissory note: it is only avidence of a debt.