Amulet Charm

An Amulet is an object whose most important characteristic is the power ascribed to it to protect its owner from danger or harm.

Pentacle... 

an amulet used in magical evocation, generally made of parchment, paper or metal (although it can be of other materials), on which the symbol of a spirit or energy being evoked is drawn. It is often worn around the neck, or placed within the triangle of evocation.

Pentacles, despite the sound of the word, often had no connotation of "five" in the old magical texts, but were, rather, magical talismans inscribed with any symbol or character. When they incorporated star-shaped figures, these were more often hexagrams than pentagrams. Pentacles showing a great variety of shapes and images appear in the old magical grimoires, such as the Key of Solomon, their use was to "fore-know all future things, & command whole nature, have power over devils, and Angels, and do miracles.

Pentagram... 

A five pointed star representing the five elements of air, fire, water, earth, and spirit.
It also represents the figure of a human being.  Long believed to be potent protection against all kinds of evil spirits and a symbol of conflict that shields the wearer and the home.  
The Pentagram should always be worn with one point up. 

Skeleton Keys...
Skeleton keys have long been used as Protective Amulets and charms,due to being made of iron, through out many cultures and folk practices.
They are also symbolic of opening doors-to occult knowledge, practices, unlocking mysteries, and removing blockages to your goals in life.

Spider... 
A Spider caught while weaving a web is said to ward off disease. The English believed by carrying around a spider in a silk bag which is then hung around the neck would ward off contagious diseases.

Toads... 
Toads are used as ingredients in brews and as familiars. Toad skins are used for the poison which is secreted from their glands when injured or provoked. The poison is hallucinogenic by lore. Depending on what type of a toad it is, the poison may just taste bad or it may kill.
Toads are used as charms, in brews, in magic remedies, in amulets, and also at the witches sabbats supposedly accoring to folklore.
In modern witchcraft they are used as familiars as they are intelligent, easy to tame and easy to care for. They are also said to have psychic powers.

Horseshoe...
A plain old everyday horseshoe is considered a good luck charm because cold iron was thought to keep evil away. To ward off evil the horseshoe must point downwards. For good luck point it upwards. It was & is nailed above the doorways on houses, churches, stables or buildings.

Seahorse... 
The dried Sea horse originating from southern Italy was carried to ward off evil. It was traditionally considered magical simply because of its beauty and strangeness.

Herbs used for protection

Rosemary is one of my favorite herbs grown in the garden.  It is easy to grow and very hardy.  This herb is  both magickal and fragrant to me. Used for magick, lay rosemary under the bed to protect the sleeper from all harm.  Rosemary when burned, emits powerful cleansing and purifying vibrations, and so is smouldered to rid a place of negativity , especially prior to performing magick.  It is one of the oldest incenses.

Magickal powers of rosemary include: protection, love, lust, mental powers, exorcism, purification, healing, sleep and youth.

Rosemary is generally used as a substitute for frankincense.

Scallop Shells may be used in protection Spells

Each time I visit the seashore I walk along the sand, as far as I can go looking out over the water at how vast the ocean really is, there's water as far as you can see. The sound of the waves moving in and out, continuously over and over is very meditative. As I walk along the sand my eyes are watching for special treasures from this place.

This trip we collected these beautiful scallop shells and just as we were leaving, a sponge happened to show up. I always feel great when bringing something back home that is a symbol of water, it's magical to me. These shells contain energy that may be placed on my altar or placed anywhere or given away. Water is one of the elements that connect all things and water is commonly associated with the qualities of emotion and intuition. Other symbolism of water is seen in the tarot as represented by the Suit of Cups. As the Element of Water itself, the Suit of Cups focuses on our conscious feelings and chosen relationships. Each card reflects another way in which we express ourselves in word and deed, as well as the inner-workings of the complex creature called love.